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HYDROGEOLOGICAL REPORT for PERUMBAKKAM EARTH QUARRY in S.F.No. 111 (P) Perumbakkam Village, Chengam Taluk, Tiruvannamalai

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HYDROGEOLOGICAL REPORT for PERUMBAKKAM EARTH QUARRY in S.F.No. 111 (P) Perumbakkam Village, Chengam Taluk, Tiruvannamalai HYDROGEOLOGICAL REPORT FOR PERUMBAKKAM EARTH QUARRY In S.F.No. 111 (P) Perumbakkam Village, Chengam Taluk, Tiruvannamalai District. 75 HYDROGEOLOGICAL REPORT FOR PERUMBAKKAM EARTH QUARRY 1. INTRODUCTION NAME OF THE APPLICANT WITH ADDRESS- Applicant Name : S.Sasikumar, Address : S/o. Sampath, No.280, Chokkanathapuram, Kori Street, Thandarampattu Taluk, Tiruvannamalai District. State : Tamilnadu. Mobile : 90478 65812 & 99431 62915 Email Id : Email Id: [email protected] DETAILS OF THE AREA- Land Classification : Tank (belongs to PWD) Survey No : 111 (P) Extent : 0.60.0Ha Village : Perumbakkam Taluk : Chengam, District : Tiruvannamalai The Clients requires detailed information on Ground Water Occurrences at Proposed Project Site is Earth quarry. The objective of the present study is to assess the availability of groundwater and comment on aspects of depth to potential aquifers, aquifer availability and type, possible yields and water quality. For this purpose all available hydrogeological information of the areas has been analyzed, and a geophysical survey was done. The investigations involved hydrogeological, geophysical field investigations and a detailed study in which the available relevant geological and hydrogeological data were collected, analyzed, collated and evaluated within the context of the Client's requirements. The data sources consulted were mainly: a) Central Ground Water Board (CGWB) Data b) State & District Geological and Hydrogeological Reports and Maps. c) Technical reports of the area by various organizations. 76 2. SCOPE OF THE WORKS – The scope of works includes: • Site visits to familiarize with the project areas. Identify any issues that might impact the Ground Water Scenario due to proposed mining activities. • To obtain, study and synthesize background information including the geology, hydrogeology and existing borehole data, for the purpose of improving the quality of assessment and preparing comprehensive hydrogeological reports, • To carry out hydrogeological evaluation and geophysical investigations in the selected sites in order to determine potential for groundwater at project site. • To prepare hydrogeological survey reports in conformity with the provisions of the rules and procedure outlined by the Central Ground Water Board (CGWB), by Assessment of water quality and potential infringement of National standards, Assessment of availability of groundwater and Impact of proposed activity on aquifer, water quality and other abstractors. 3. BACKGROUND INFORMATION Location The investigated site falls in the Toposheet No: 57-P/04 Latitude between 12°12'36.06"N to 12°12'52.65"N and Longitude between 78°59'27.93"E to 78°59'42.95"E on WGS datum-1984. 4. REGIONAL GEOLOGY OF TIRUVANNAMALAI DISTRICT- Tiruvannamalai District mainly comprises of rocks of Archaeon age. The type of rocks found in the district are Charnockite, Granitic gneiss, Epidote Hornblende Gneiss, Amphibolite, Pyroxenite, Dunite, Migmatites, Banded Magnetite Quartzite, Shale and Clay. Dolerite dykes (Black Granite) are also noticed cutting across the country rocks. The hard rock terrain comprises predominantly of Charnockite and Khondalite groups and their migmatitic derivatives, supra-crustal sequences of Sathyamangalam and Kolar groups and Peninsular Gneissic Complex (Bhavani Group), intruded by ultramafic-mafic complexes, basic dykes, granites and syenites. The sedimentary rocks of the coastal belt include fluviatile, fluvio-marine and marine sequences, such as Gondwana Supergroup (Carboniferous to Permian and Upper Jurassic to Lower Cretaceous), marine sediments of Cauvery basin (Lower Cretaceous to Paleogene), Cuddalore /Pannambarai Formation (Mio- Pliocene) and sediments of Quaternary and Recent age. 77 The Charnockite Group comprises pyroxene granulite and charnockite. The pyroxene granulite is dark grey, medium grained granulitic rock with typical salt and pepper texture, seen on the weathered surface. It consists of diopside, hypersthene, plagioclase, hornblende, biotite and quartz. Charnockite is the predominant rock in the area. It is grey, medium to coarse grained, greasy looking with foliation seen prominently on the weathered surface. It is essentially made of smoky or grey quartz, pale grey microcline and hypersthene as major minerals with plagioclase, hornblende and biotite as accessories. Migmatite Complex is represented by hornblende-biotite gneiss, granitic gneiss and pink migmatite. This Complex is a group of banded felsic rocks of varying mineralogical composition that are formed due to the influx of quartzofeldspathic material into high grade metamorphic rocks. Two types of migmatite are seen in the district, one is grey and the other is pink. Next to charnockite, migmatite gneiss is the second most extensive rock. The migmatite gneiss consists of quartz, k- feldspar, plagioclase, hornblende and biotite in varying proportions. AGE FORMATION Recent - Quaternary Formation (Earth) ---------Unconformity----------- Archaean - Charnockite Peninsular Gneiss complex DRAINAGE Cheyyar River which originates from Jawadhu Hills, flows in a southern direction at first, and turns south-east near Chengam after flowing through Polur, Vandavasi and Cheyyar taluks. Palar rising near Nandidurg in Mysore enters Vellore district passing through Gudiyatham, Walajah and Arakonam taluks before entering into Cheyyar taluk of Tiruvannamalai district and there after enters into Kancheepuram district. Pennaiyar and South Pennaiyar originate from Nandidurg of Karnataka. They pass through Dharmapuri district and enter southern part of Chengam taluk before entering in to Viluppuram district. Finally, the river enters into the Bay of Bengal at Cuddalore. The river is dry for the most part of the year. Water flows during the monsoon season when it is fed by the southwest monsoon in catchment area and the northeast monsoon in Tamil Nadu. A dam has been constructed across this river at Sathanur which is a picnic spot in this district. Sathanur Reservoir 78 provides drinking water to Tiruvannamalai town and the water is used for irrigation when the reservoir is filled with surplus water. SOILS The red loamy soil is predominantly found here. However Polur taluk has concentration of red series loam. The district has also different types of soils such as ferruginous loamy and sandy loamy however black series loam is found in tanks and river beds of Cheyyar and Vandavasi Taluks. 5. GEOPHYSICAL INVESTIGATION METHODS A variety of methods are available to assist in the assessment of geological sub- surface conditions. The main emphasis of the fieldwork undertaken was to determine the thickness and composition of the sub-surface formations and to identify water-bearing zones. This information was principally obtained in the field using, and vertical electrical soundings (VES). The VES probes the resistivity layering below the site of measurement. This method is described below. Resistivity Method Vertical electrical soundings (VES) were carried out to probe the condition of the sub- surface and to confirm the existence of deep groundwater. The VES investigates the resistivity layering below the site of measurement. Basic Principles The electrical properties of rocks in the upper part of the earth's crust are dependent upon the lithology, porosity, and the degree of pore space saturation and the salinity of the pore water. Saturated rocks have lower resistivity than unsaturated and dry rocks. The higher the porosity of the saturated rock, or the higher the salinity of the saturating fluids, the lower is the resistivity. The presence of clays and conductive minerals also reduces the resistivity of the rock. The resistivity of earth materials can be studied by measuring the electrical potential distribution produced at the earth's surface by an electric current that is passed through the earth. Current is moved through the subsurface from one current electrode to the other and the potential difference is recorded as the current passes. From this information, resistivity values of various layers are acquired and layer thickness can be identified. The apparent resistivity values determined are plotted as a log function versus the log of the spacing between the electrodes. These plotted curves identify thickness of layers. If there are multiple layers (more than 2), the acquired data is compared to a master curve to determine layer thickness. 79 This method is least influenced by lateral in-homogeneities and capable of providing higher depth of investigation. The resistance R of a certain material is directly proportional to its length L and cross- sectional area A, expressed as: R = Rs * L/A (in Ohm) Where Rs is known as the specific resistivity (characteristic of the material and independent of its shape or size) With Ohm's Law, R = dV/I (Ohm) Where dV is the potential difference across the resistor and I is the electric current through the resistor. The specific resistivity may be determined by: Rs = (A/L) * (dV/I) (in Ohm m) Vertical Electrical Sounding (VES) When carrying out a resistivity sounding, current is led into the ground by means of two electrodes. With two other electrodes, situated near the center of the array, the potential field generated by the current is measured. From the observations of the current strength and the potential difference, and taking into account the electrode separations, the ground resistivity can be determined. During a resistivity sounding, the separation between the electrodes is step-wise increased (known as a
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